package com.yupi.springbootinit.utils;

/**
 * @Author FengHuan Wang
 * @Date 2025/2/7 12:54
 * @Version 1.0
 */

import cn.hutool.core.collection.CollUtil;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.support.ExcelTypeEnum;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;

import org.springframework.web.multipart.MultipartFile;



import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * Excel相关工具类
 */
@Slf4j
public class ExcelUtils {


    public static  String excelToCsv(MultipartFile multipartFile) {
       /* try {
            file = ResourceUtils.getFile("classpath:test_excel.xlsx");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }*/
        List<Map<Integer, String>> list = null;
        try {
            list = EasyExcel.read(multipartFile.getInputStream())
                    .excelType(ExcelTypeEnum.XLSX)
                    .sheet()
                    .headRowNumber(0)
                    .doReadSync();
        } catch (IOException e) {
            log.error("表格处理错误");
        }

        if (CollUtil.isEmpty(list)) {
            return "";
        }
        StringBuilder stringBuilder = new StringBuilder();
        //转化为csv文件
        //读取表头
        LinkedHashMap<Integer, String> headerMap = (LinkedHashMap) list.get(0);
        List<String> headerList = headerMap.values().stream().filter(ObjectUtils::isNotEmpty).collect(Collectors.toList());
        stringBuilder.append(StringUtils.join(headerList, ",")).append("\n");
        //读取数据
        for (int i = 1; i < list.size(); i++) {
            LinkedHashMap<Integer, String> dataMap = (LinkedHashMap) list.get(i);
            List<String> dataList = dataMap.values().stream().filter(ObjectUtils::isNotEmpty).collect(Collectors.toList());
            stringBuilder.append(StringUtils.join(dataList, ",")).append("\n");
        }
        return stringBuilder.toString();
    }
}
